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Technical data sheet · ThinkSystem V4 · 2U four-socket

Lenovo ThinkSystem SR850 V4Specifications, configurations & comparisons

The ThinkSystem SR850 V4 fits four Intel Xeon 6700P-series processors, 64 DDR5 slots and up to 16 TB of memory into a 2U chassis, for in-memory databases, analytics and consolidation projects that have outgrown two sockets but not their rack space. This data sheet maps every documented option — seven processors, 2.5-inch or E3.S fronts, CXL memory, riser and GPU rules — and the compromises the compact chassis forces.

2U Rack2 or 4 socketsXeon 6 P-coreXClarity Controller 3
86cores per CPU344 per server · Xeon 6 P-core
16TBDDR5 maximum64 DIMM slots
32drive bays4 backplane options
4GPUs2 accelerators listed
3,200Wlargest PSU7 supply options
7processor SKUs1 family

Every figure checked against the Lenovo ThinkSystem SR850 V4 Server (September 7, 2026)

Form factor
2U Rack · 4 sockets
Processors
Xeon 6 P-core
Memory
64 × DDR5 RDIMM · up to 16 TB
Drive bays
Up to 32 · 4 backplane options
Expansion
9 × PCIe · 2 × OCP 3.0
GPUs
Up to 4 · 2 listed
Boot
M.2 · 5 boot options
Management
XClarity Controller 3
01 — Overview

The SR850 V4 at a glance

Our read of Lenovo’s documentation: where the SR850 V4 is strong, and the limits worth knowing before you spec one.

Strengths

  • Four sockets and 64 DIMM slots in 2U: filled with 256 GB 3DS RDIMMs the server reaches 16 TB, the same ceiling Lenovo quotes for the 4U SR860 V4.
  • Every NVMe bay — up to 24 × 2.5-inch or 32 × E3.S 1T — connects to a processor through onboard ports on a full PCIe 5.0 x4 link, so there are no retimer cards and no oversubscription.
  • CXL 2.0 memory: sixteen 96 GB or 128 GB E3.S 2T modules can join the DDR5, either interleaved into one pool or presented as a separate tier.
  • A two-processor build with 32 DIMM slots is supported, so the second pair of sockets can be filled later.
  • Two dedicated OCP 3.0 slots, each PCIe 5.0 x16, carry adapters of up to 400GbE without spending a riser slot.

Watch-outs

  • Nine PCIe slots at most, seven with the double-wide-GPU risers, where the SR850 V3 listed twelve; the Neptune water module also takes slots 6, 7 and 8.
  • Power stops at a redundant pair of supplies, and the AC units are high-range only — Lenovo states there is no 115 V support.
  • Two double-wide GPUs is the limit, and the rear hot-swap M.2 cage sits in the space one of them would use.
  • The front is 2.5-inch or E3.S, never a mix, and Lenovo says every E3.S or CXL layout needs all four processors (its CXL rules allow two only by special bid).
  • Running on two processors leaves four usable PCIe slots (3, 5, 9, 11), eight NVMe drives and no double-wide cards.
Processors7 SKUs
Cores / CPU8–86
DIMM slots64
Backplanes4
Max bays32
GPUsup to 4
PSU options7 · to 3,200 W
02 — Processors

7 supported processors, mapped

Lenovo lists seven Xeon 6700P-series parts for the SR850 V4, from the 8-core, 165 W 6714P to the 86-core, 350 W 6788P. All seven share 88 PCIe 5.0 lanes, eight memory channels rated to 6400 MHz and four UPI 2.0 links at 24 GT/s; they differ in cores, clocks, cache and accelerator count. Builds take two or four processors — one or three are not supported.

Processor landscape — cores × TDP

7 SKUs · 1 family
Lenovo ThinkSystem SR850 V4: every supported processor by cores and TDP0816243240485664728088150 W200 W250 W300 W350 WCores per processorIntel Xeon 6 6788P — 86 cores / 172 threads · 350 W · 2 GHz base · 336 MB cache · DDR5-6400Intel Xeon 6 6768P — 64 cores / 128 threads · 330 W · 2.4 GHz base · 336 MB cache · DDR5-6400Intel Xeon 6 6748P — 48 cores / 96 threads · 300 W · 2.5 GHz base · 192 MB cache · DDR5-6400Intel Xeon 6 6738P — 32 cores / 64 threads · 270 W · 2.9 GHz base · 144 MB cache · DDR5-6400Intel Xeon 6 6728P — 24 cores / 48 threads · 210 W · 2.7 GHz base · 144 MB cache · DDR5-6400Intel Xeon 6 6724P — 16 cores / 32 threads · 210 W · 3.6 GHz base · 72 MB cache · DDR5-6400Intel Xeon 6 6714P — 8 cores / 16 threads · 165 W · 4 GHz base · 48 MB cache · DDR5-64006 6788P86 cores · 4.1 W/core — top SKU and most efficient
Xeon 6 P-core 7Bubble size = L3 cache · hover a bubble for the full SKU

Processor explorer

filter · sort · compare
ProcessorCores / threadsBaseL3 cacheTDPW / coreMemory
Intel Xeon 6 6788P86 / 1722 GHz336 MB350 W4.1DDR5-6400
Intel Xeon 6 6768P64 / 1282.4 GHz336 MB330 W5.2DDR5-6400
Intel Xeon 6 6748P48 / 962.5 GHz192 MB300 W6.3DDR5-6400
Intel Xeon 6 6738P32 / 642.9 GHz144 MB270 W8.4DDR5-6400
Intel Xeon 6 6728P24 / 482.7 GHz144 MB210 W8.8DDR5-6400
Intel Xeon 6 6724P16 / 323.6 GHz72 MB210 W13.1DDR5-6400
Intel Xeon 6 6714P8 / 164 GHz48 MB165 W20.6DDR5-6400
  • The 6714P and 6724P use the LCC die: they carry half the on-die accelerators of the other five SKUs (QAT, DLB, DSA and IAA at two apiece rather than four) and cannot run CXL memory in heterogeneous mode.
  • With an LCC processor the factory will only preset the General Computing – Power Efficiency UEFI profile; others must be set on site. Lenovo describes that default as the only ERP Lot 9-compliant mode for UK and EU buyers.
  • Air cooling uses standard heatsinks in every socket for lower-TDP chips; higher-TDP chips keep standard heatsinks at the front and take winged performance heatsinks in the rear sockets.
  • The Processor Neptune Core Module — factory-fit only — carries all processor heat out through an open water loop and works with every SKU, two or four CPUs and every front layout.
  • Every SKU supports a 512 GB SGX enclave, and processor option kits ship with a heatsink but without a system fan.
03 — Memory

64 DIMM slots, 16 per processor

Each processor has eight DDR5 channels with two slots apiece, so four processors give 64 slots and two give 32 (an 8 TB ceiling). Lenovo lists five TruDDR5 parts, all rated 6400 MHz, and supports only the quantities in its table: with four processors the 32 GB and 64 GB parts can be fitted in lots as small as four, while the 96 GB, 128 GB and 256 GB parts start at 32.

Capacity with every slot filled

by DIMM size
32 GB2 TB64 GB4 TB96 GB6 TB32 or 64 DIMMs (4 CPUs)128 GB8 TB32 or 64 DIMMs (4 CPUs)256 GB16 TB3DS · 32, 48* or 64 (4 CPUs)64 slots · 16 per processor · each tick = one DIMM

Operating speed

per Lenovo memory tables
Processor1 DIMM / channel2 DIMMs / channel
Xeon 6700P-series6400 MHz5200 MHz*
  • * Lenovo gives 5200 MHz at two DIMMs per channel for RDIMMs and does not quote a separate two-per-channel figure for 3DS RDIMMs.
  • All DIMMs in the server must share one part number. Twelve 256 GB DIMMs per processor (24 or 48 in total) are marked as planned for November 2026.
  • CXL modules go in the front E3.S 2T bays but are not hot-swap. They need four processors (two only by special bid), the E3.S chassis with all eight 2x2T backplanes, exactly 16 modules and 32 RDIMMs of the same capacity, and Windows Server and VMware ESXi cannot use them.
  • Heterogeneous mode (C8VB) interleaves DDR5 and CXL as one NUMA domain and accepts only the 128 GB RDIMM; 2-tier mode (C8VC) keeps CXL as a separate node with 96 GB or 128 GB RDIMMs. Mirroring rules out both.
  • The guide still says 16 CXL modules cannot run with Intel VMD enabled, pending a firmware fix it dates to 4Q/2025.
  • Protection covers ECC, bounded fault correction, SDDC and ADDDC on x4 DIMMs, and channel mirroring, which leaves half the installed capacity usable.
04 — Storage

4 backplane options, up to 32 bays

The SR850 V4 front is built either from 8-bay 2.5-inch backplanes (one to three) or from 4-bay E3.S backplanes (two to eight), never both, and boot drives sit on an internal M.2 module or in a rear hot-swap M.2 pair. The layouts below are complete configurations from Lenovo’s storage table; the chart after them plots the four individual backplane kits.

Headline layouts

front panel view

Front panel

Config 9-2: three SAS/SATA backplanes run by an 8-port RAID adapter (940-8i or 545-8i) plus a 16-port RAID adapter or HBA; valid with two or four processors.

SAS/SATANVMeSAS/SATA + NVMe

Controllers & boot

  • Onboard NVMe (Non RAID NVMe, BC4V) - PCIe 5.0 — Software RAID. CTO only; RAID optional via Intel VROC; max qty 1
  • ThinkSystem 440-16i SAS/SATA PCIe Gen4 12Gb HBA — HBA. no RAID; max qty 2; no supercap
  • ThinkSystem RAID 545-8i PCIe Gen4 12Gb Adapter — RAID. RAID 0, 1, 10; max qty 3; no supercap
  • ThinkSystem RAID 940-8i 4GB Flash PCIe Gen4 12Gb Adapter — RAID, 4GB cache. RAID 0, 1, 10, 5, 50, 6, 60; max qty 2; supercap included; supports Tri-Mode with feature CH5Z
  • ThinkSystem RAID 940-16i 8GB Flash PCIe Gen4 12Gb Adapter — RAID, 8GB cache. RAID 0, 1, 10, 5, 50, 6, 60; max qty 2; supercap included; supports Tri-Mode with feature CH5Z
  • ThinkSystem RAID 940-8i 4GB Flash PCIe Gen4 12Gb Adapter for U.3 (BGM1) — RAID, 4GB cache. deprecated Tri-Mode feature code, existing orders only; max qty 2; supercap included
  • ThinkSystem RAID 940-16i 8GB Flash PCIe Gen4 12Gb Adapter for U.3 (BDY4) — RAID, 8GB cache. deprecated Tri-Mode feature code, existing orders only; max qty 1; supercap included
  • Intel VROC RAID1 Only — Software RAID. onboard NVMe RAID 1 only; Intel and non-Intel NVMe SSDs
  • M.2 RAID B550i-2i SATA/NVMe Enablement Kit (internal, 2 x M.2 NVMe, Broadcom RAID) — boot
  • M.2 RAID B545i-2i SATA/NVMe Adapter (internal, 2 x M.2 SATA/NVMe, Broadcom RAID) — boot
  • M.2 B350i-2i NVMe Enablement Kit (internal, 2 x M.2 NVMe, optional VROC RAID) — boot
  • M.2 RAID B550p-2HS SATA/NVMe Enablement Kit (rear hot-swap, 2 x M.2 NVMe, Broadcom RAID) — boot
All 16 controllers and 5 boot options
  • Intel VROC (VMD NVMe RAID) Standard — Software RAID. onboard NVMe RAID 0, 1, 10
  • Intel VROC (VMD NVMe RAID) Premium — Software RAID. onboard NVMe RAID 0, 1, 10, 5
  • ThinkSystem M.2 RAID B550i-2i SATA/NVMe Enablement Kit — Boot. internal M.2, NVMe only, integrated Broadcom SAS3808N RAID, x1 lane per drive
  • ThinkSystem M.2 RAID B545i-2i SATA/NVMe Adapter — Boot. internal M.2, SATA or NVMe, integrated Broadcom SAS3808N RAID, x1 lane per drive
  • ThinkSystem M.2 B350i-2i NVMe Enablement Kit — Boot. internal M.2, NVMe only, x2 lanes per drive, RAID via VROC (BZ4X RAID1 Only or BS7M Standard)
  • ThinkSystem M.2 RAID B550p-2HS SATA/NVMe Enablement Kit — Boot. rear hot-swap M.2, NVMe only, integrated Broadcom SAS3808N RAID; requires full-height slot config
  • ThinkSystem SR850 V4/SR860 V4 Rear M.2 RAID B540p-2HS SATA/NVMe Enablement Kit — Boot. rear hot-swap M.2, SATA or NVMe, integrated Broadcom SAS3808N RAID; requires full-height slot config
  • ThinkSystem 440-16e SAS/SATA PCIe Gen4 12Gb HBA — HBA. External SAS HBA (JBOD to external enclosures/tape), part 4Y37A09724 feature B8P7 - lp2230 L2394
  • Rear M.2 RAID B540p-2HS SATA/NVMe Enablement Kit (rear hot-swap, 2 x M.2 SATA/NVMe, Broadcom RAID) — boot
  • No onboard SATA: SAS and SATA drives need a RAID adapter or HBA, and E3.S drives can only run from the onboard NVMe ports.
  • RAID 940-8i and 940-16i adapters handle U.3 NVMe in Tri-Mode (CTO feature CH5Z since July 2026) on AnyBay bays, linking each NVMe drive over a single lane; only U.3 drives qualify, not U.2.
  • The guide still describes the AnyBay backplane as NVMe-only, with SAS/SATA support planned for early 4Q/2025.
  • Two supercaps fit, so no more than two flash-backed RAID adapters can be installed, counting internal and external ones together.
  • NVMe RAID 5 needs VROC Premium, and ESXi supports VROC only as RAID 1. Storage configs 7-4, 8-4, 12-4, 13-4, 14-4 and 15-4 support neither M.2 option.

Every documented backplane

4 with drive bays
8x 2.5-inch AnyBay Gen5 backplane (4XH7B08875 / C3…8x 2.5-inch AnyBay Gen5 backplane (4XH7B08875 / C3RU), PCIe Gen5 / 24Gb SAS, qty 1, 2 or 388x 2.5-inch SAS/SATA backplane (4XH7B08874 / C3RT)…8x 2.5-inch SAS/SATA backplane (4XH7B08874 / C3RT), 12Gb SAS, qty 1, 2 or 38E3.S 4x1T NVMe Gen5 backplane (4XH7B08876 / C221),…E3.S 4x1T NVMe Gen5 backplane (4XH7B08876 / C221), qty 2, 4, 6 or 84E3.S 2x2T NVMe Gen5 backplane (4XH7B08877 / C222) …E3.S 2x2T NVMe Gen5 backplane (4XH7B08877 / C222) for CXL memory modules, qty 2, 4, 6 or 82Bays · solid = front · dashed = rear · brighter = NVMe-only
2.5-inch3.5-inchEDSFF (E1.S / E3.S)
05 — Accelerators & I/O

GPUs, PCIe and networking

GPUs go in the rear risers (every SR850 V4 uses the three-riser layout). Up to four low-profile NVIDIA L4 cards go in slots 3, 4, 9 and 10 (slots 3 and 9 are x8 electrically), or two double-wide L40S cards in slots 4 and 10 on the C95G riser with auxiliary power. Both are Controlled GPUs, and all GPUs in a server must be identical. Up to 4 × single-wide (L4) or 2 × double-wide (L40S); two-processor builds take single-wide cards only.

NVIDIA L4 24GB PCIe Gen4 Passive GPU

single-wide
24GB · up to 4

NVIDIA L40S 48GB PCIe Gen4 Passive GPU

double-wide
48GB · up to 2

I/O topology

88 lanes per CPU
CPU 188 × PCIe 5.08 ch · 16 DIMMCPU 288 × PCIe 5.08 ch · 16 DIMMCPU 388 × PCIe 5.08 ch · 16 DIMMCPU 488 × PCIe 5.08 ch · 16 DIMMUPI 2.0 · 3-link mesh · 24 GT/s9 PCIe slots · 3 risers7 × Gen5 + 2 × Gen4 · 6 FH, 3 LPDouble-wide GPU risers7 × Gen5 · DW cards in slots 4, 102 × OCP 3.0 · Gen5 x16up to 400GbE · NC-SI to XCC3XCC3 · 1GbE mgmt portAST2600 BMC · OpenBMC · Premier

Each Xeon 6700P brings 88 PCIe 5.0 lanes and eight memory channels, and Lenovo joins the four sockets with three UPI 2.0 links in a mesh. Nine rear slots sit on three risers — Riser 1 (slots 3–5) and Riser 3 (slots 9–11) are full-height, Riser 2 (slots 6–8) is low-profile — beside two OCP 3.0 slots.

Network adapters Lenovo lists

14 options
AdapterPortsForm
Intel E610-T2 10GBase-T 2-Port OCP Ethernet Adapter (Generic FW)2 × 10GbEOCP 3.0
Broadcom 57504 10/25GbE SFP28 4-Port OCP Ethernet Adapter4 × 25GbEOCP 3.0
Intel E810-DA2 10/25GbE SFP28 2-Port OCP Ethernet Adapter2 × 25GbEOCP 3.0
Mellanox ConnectX-6 Lx 10/25GbE SFP28 2-port OCP Ethernet Adapter2 × 25GbEOCP 3.0
Nvidia ConnectX-6 Dx 100GbE QSFP56 2-port OCP Ethernet Adapter (Generic)2 × 100GbEOCP 3.0
Broadcom 57608 2x200/1x400GbE QSFP112 OCP Ethernet Adapter (Generic FW)2 × 400GbEOCP 3.0
Broadcom 5719 1GbE RJ45 4-Port PCIe Ethernet Adapter4 × 1GbEPCIe
Intel E610-T4 10GBase-T 4-Port PCIe Ethernet Adapter (Generic FW)4 × 10GbEPCIe
Broadcom 57504 10/25GbE SFP28 4-port PCIe Ethernet Adapter4 × 25GbEPCIe
Mellanox ConnectX-6 Lx 10/25GbE SFP28 2-port PCIe Ethernet Adapter2 × 25GbEPCIe
Nvidia ConnectX-7 10/25GbE SFP28 4-Port PCIe Ethernet Adapter (Generic)4 × 25GbEPCIe
Mellanox ConnectX-6 Dx 100GbE QSFP56 2-port PCIe Ethernet Adapter2 × 100GbEPCIe
NVIDIA ConnectX-7 NDR200/200GbE QSFP112 2-port PCIe Gen5 x16 InfiniBand Adapter2 × 200GbE / NDR200 InfiniBandPCIe
NVIDIA ConnectX-7 NDR400 OSFP 1-port PCIe Gen5 VPI Adapter1 × 400GbE / NDR InfiniBandPCIe
  • Lenovo’s processor table rates each CPU for four UPI 2.0 links at 24 GT/s; the server description says the processors are joined by three links in a mesh.
  • A lower-cost riser set also gives seven Gen5 slots, but six of them are x8 and rear M.2 is not supported with it.
  • The optional serial port takes slot 8; rear hot-swap M.2 takes slots 3 and 4.
  • Every x8 slot has a physical x16 connector.
  • With two processors only slots 3, 5, 9 and 11 are live, though both OCP slots stay available.
  • One port on each OCP adapter can be shared with the XClarity Controller for NC-SI and Wake-on-LAN.
  • The specification table and riser section give both OCP slots a PCIe 5.0 x16 interface; the network-adapter section describes each as x8 or x16.
06 — Power & cooling

7 power supplies, 1,300–3,200 W

The SR850 V4 takes at most two hot-swap CRPS supplies, working as a redundant pair, and mixing models is not allowed. The list covers Titanium AC units of 2000, 2700 and 3200 W, two 2700 W Platinum units, a 1300 W HVAC/HVDC unit and a 1300 W −48 V DC unit.

05001000150020002500300035001300 W not stated — -48V DC (-44V to -54V), CRPS Premium, BizLink 115H0-025987-R1 connector; efficiency rating not stated in doc; max 21300DC1300 W Platinum — HVAC/HVDC 200-277V AC / 240-380V DC, CRPS Premium, Amphenol 10167814-002 connector; max 21300Platinum2000 W Titanium — 230V AC, CRPS Premium, C14 connector; max 22000Titanium2700 W Platinum — 230V AC, CRPS v2.3, C20 connector; max 22700Platinum2700 W Platinum — 230V AC, CRPS v2.4, C20 connector; max 22700Platinum2700 W Titanium — 230V AC, CRPS Premium, C20 connector; max 22700Titanium3200 W Titanium — 230V AC, CRPS Premium, C20 connector; max 23200TitaniumWatts · dashed line = output at 100–120 V low line
AC277 VAC / HVDC−48 V DC
  • AC supplies need high-range 200–240 V input; Lenovo says 115 V is not supported, and in China every supply also runs from 240 V DC.
  • The 2000 W unit has a C14 inlet. The 2700 W Titanium, 2700 W Platinum and 3200 W units use C20 and draw up to 15 A, 16 A and 16 A at 200 V AC.
  • Zero-output (cold-redundancy) mode, which idles one supply at light load, works only with the CRPS Premium models: the Titanium, HVAC/HVDC and −48 V units.
  • Two input ranges are printed for the −48 V unit — −44 to −54 V DC beside the supply list and −48 to −60 V among the electrical specifications — with a 29.8 A inlet current; the HVAC/HVDC unit takes 200–277 V AC or 240–380 V DC.
  • The comparison table and specification summary list a 1300 W AC option; in the power-supply table the only 1300 W units are the HVAC/HVDC (200–277 V AC or 240–380 V DC) and −48 V DC supplies.
07 — Management, security & OS

Run it, secure it, choose the OS

Management

  • XClarity Controller 3 on an ASPEED AST2600 BMC running OpenBMC, with XCC3 Premier built in
  • Remote console shared by up to six users, virtual media, boot and crash video capture, power capping
  • System Guard, Neighbor Group, syslog alerting and SED key management (Premier features)
  • Dedicated rear 10/100/1000 Mbps RJ-45 management port · NC-SI through an OCP port
  • IPMI 2.0 (IPMI-over-LAN off by default), Redfish, SNMPv3, CIM-XML
  • XClarity Provisioning Manager (F1 at boot) · XClarity One cloud management, licensed per endpoint
  • XClarity Essentials — V4 servers need OneCLI 5.x, UpdateXpress 5.x and BOMC 14.x or later
  • XClarity Energy Manager (one node licence included with Premier) · Lenovo Capacity Planner
  • MicroSD slot on the DC-SCM I/O board for up to 4 GB of XCC remote-disc storage
  • Optional External Diagnostics Handset · XClarity One Mobile over the front USB port

Security

  • Platform Firmware Resiliency hardware Root of Trust (NIST SP 800-193)
  • TPM 2.0 · Nationz TPM 2.0 module for China
  • UEFI Secure Boot, set in the factory or left to the customer (cannot be turned off once enabled)
  • Intel TDX, SGX, TME and TME-MK
  • CNSA Suite 1.0 and FIPS 140-3 (validation in progress) cryptography for XCC
  • Self-encrypting drives with KMIP key managers (IBM SKLM, Thales KeySecure)
  • NIST SP 800-147B compliant
  • Optional chassis intrusion switch and lockable 2U security bezel

Operating systems

  • Microsoft Windows Server 2022 and 2025
  • Red Hat Enterprise Linux 9.6, 9.7, 9.8, 10.0, 10.1 and 10.2
  • SUSE Linux Enterprise Server 15 SP7 and 16
  • Ubuntu 22.04, 24.04 and 26.04 LTS
  • VMware ESXi 9.1
08 — Compare

SR850 V3 → SR850 V4

Lenovo’s guide sets the SR850 V4 against the SR850 V3 it replaces. The 2U four-socket chassis, 64 DIMM slots and 16 TB ceiling carry over; what changes is the processor, memory speed, E3.S and CXL support and management — and expansion, where the V4 lists fewer PCIe slots.

Previous generationThinkSystem SR850 V3
This modelThinkSystem SR850 V4
Processors
4 × 4th Gen Xeon Scalable · up to 60 cores · 350 W
4 × Xeon 6700P-series · up to 86 cores · 350 W
PCIe lanes per CPU
80 × PCIe 5.0
88 × PCIe 5.0
Memory speed
4800 MHz (1 DPC) · 4400 MHz (2 DPC)
6400 MHz (1 DPC) · 5200 MHz (2 DPC)
Memory types
RDIMM, 3DS RDIMM, 9x4 RDIMM
RDIMM, 3DS RDIMM · up to 16 CXL 2.0 modules
Maximum memory
16 TB · 64 DIMMs
16 TB · 64 DIMMs
Front drive bays
Up to 24 × 2.5"
Up to 24 × 2.5" or 32 × E3.S 1T
Boot
2 × internal M.2 · 2 × rear 7mm
2 × internal M.2 · 2 × rear hot-swap M.2
PCIe slots
Up to 12 (8 × Gen5 + 4 × Gen4)
Up to 9 (7 × Gen5 + 2 × Gen4)
GPUs
4 single-wide or 2 double-wide
4 single-wide or 2 double-wide
Management
XClarity Controller 2
XClarity Controller 3 (OpenBMC)
Cooling
6 hot-swap fans, N+1 rotor
6 hot-swap fans · optional Neptune Core water
Power supplies
2 · 1100–2600 W AC
2 · 1300–3200 W · −48 V DC and HVAC/HVDC

Source: Lenovo Press LP2230 (SR850 V4 product guide), Table 2 — Comparing the SR850 V4 to the previous generation SR850 V3.

The SR850 V4 family side by side

Lenovo builds its V4 four-socket line in two sizes: this 2U SR850 V4 and the 4U SR860 V4, which share the same seven processor SKUs, five DIMMs and backplane kits but give the larger box more bays, slots, GPUs and supplies. The SR850 V3 precedes it, the SR950 V3 goes to eight sockets and the SR650 V4 is the two-socket Xeon 6 option. Bars come from each model’s own spec file.

SR850 V4SR860 V4SR850 V3SR860 V3SR950 V3SR650 V4Cores / CPUSR850 V4: 8686SR860 V4: 8686SR850 V3: 6060SR860 V3: 6060SR950 V3: 6060SR650 V4: 8686DIMM slotsSR850 V4: 6464SR860 V4: 6464SR850 V3: 6464SR860 V3: 6464SR950 V3: 128128SR650 V4: 3232Max memorySR850 V4: 16 TB16SR860 V4: 16 TB16SR850 V3: 16 TB16SR860 V3: 16 TB16SR950 V3: 32 TB32SR650 V4: 8 TB8Max drive baysSR850 V4: 3232SR860 V4: 5656SR850 V3: 2424SR860 V3: 4848SR950 V3: 1616SR650 V4: 4040Max GPUsSR850 V4: 44SR860 V4: 88SR850 V3: 44SR860 V3: 88SR950 V3: 00SR650 V4: 1010Largest PSUSR850 V4: 3,200 W3,200SR860 V4: 3,200 W3,200SR850 V3: 2,700 W2,700SR860 V3: 2,700 W2,700SR950 V3: 1,800 W1,800SR650 V4: 3,200 W3,200
This modelSiblings and successorEach value from that model’s own verified spec file · bars scale per column

Head-to-head comparisons

Every figure on this page, set against the machines buyers weigh it up with.

09 — Use cases

Five builds that suit the SR850 V4

Five builds that use only options our configurator allows on the SR850 V4. Open any of them to adjust it; before quoting we check the exact combination against Lenovo’s storage-configuration, riser and GPU rules.

In-memory database

16 TB in 2U

The case the SR850 V4 is built for: 64 × 256 GB 3DS RDIMMs give 16 TB behind four 86-core processors, in half the rack height of an SR860 V4. Eight onboard-NVMe drives hold persistence and logs, and Lenovo reserves machine type 7DJU for SAP HANA builds.

  • 4 × Xeon 6 6788P — 86 cores @ 2 GHz, 350 W each
  • 64 × 256 GB TruDDR5 3DS RDIMM — 16 TB, two per channel
  • 8 × 7.68 TB NVMe U.3 on the onboard PCIe 5.0 ports
  • 2 × 480 GB M.2 NVMe boot
  • NVIDIA ConnectX-6 Dx 2 × 100GbE OCP 3.0
  • 2 × 3200 W Titanium CRPS Premium
  • Red Hat Enterprise Linux 9

Lenovo warns of ambient-temperature limits for high-capacity DIMMs paired with high-TDP processors and points to the SR850 V4 User Guide for the figures. Eight NVMe drives on one AnyBay backplane (config 3-2) is a four-processor layout.

Open this build in the configurator →
Virtualisation

Hyper-V consolidation host

Four 48-core processors give 192 cores for Windows Server Datacenter virtual machines, and 32 DIMMs keep every channel at one DIMM so memory runs at 6400 MHz. Eight SAS SSDs sit behind a flash-backed RAID 940, and four 25GbE ports use one OCP slot, leaving the other free.

  • 4 × Xeon 6 6748P — 48 cores @ 2.5 GHz, 300 W each
  • 32 × 64 GB TruDDR5 RDIMM — 2 TB
  • 8 × 3.84 TB 2.5-inch SAS SSD on a RAID 940-8i (4 GB flash)
  • 2 × 480 GB M.2 NVMe boot
  • Broadcom 57504 4 × 25GbE OCP 3.0
  • 2 × 2700 W Titanium CRPS Premium
  • Windows Server 2025 Datacenter

Windows Server cannot use CXL memory, so this host grows its memory with DIMMs only.

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Analytics

E3.S NVMe analytics node

The E3.S chassis wires eight Gen5 NVMe bays to each processor. This build starts with four 15.36 TB E3.S drives, 4 TB of memory at one DIMM per channel and an OCP adapter that runs two 200GbE ports or one 400GbE port.

  • 4 × Xeon 6 6768P — 64 cores @ 2.4 GHz, 330 W each
  • 32 × 128 GB TruDDR5 RDIMM — 4 TB
  • 4 × 15.36 TB E3.S 1T NVMe (PCIe 5.0)
  • Intel VROC Standard — NVMe RAID 0, 1, 10
  • 2 × 480 GB M.2 NVMe boot
  • Broadcom 57608 2 × 200GbE / 1 × 400GbE OCP 3.0
  • 2 × 3200 W Titanium CRPS Premium
  • Ubuntu Server 24.04 LTS

Lenovo supplies E3.S 1T backplanes in quantities of two, four, six or eight, so a real E3.S front starts at eight bays, and every E3.S layout needs four processors. No RAID adapter serves E3.S — only onboard NVMe with VROC. At 32 × 61.44 TB the chassis holds 1966.08 TB raw.

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AI inference

Two-GPU inference server

A pair of 48 GB L40S double-wide cards in slots 4 and 10 — the most the SR850 V4 takes — with four 32-core processors, 2 TB of memory and Gen4 NVMe for model files, plus 100GbE on an OCP slot so no riser slot goes to networking.

  • 4 × Xeon 6 6738P — 32 cores @ 2.9 GHz, 270 W each
  • 2 × NVIDIA L40S 48 GB, double-wide, slots 4 and 10
  • 32 × 64 GB TruDDR5 RDIMM — 2 TB
  • 8 × 3.84 TB NVMe U.3 on onboard ports
  • 2 × 480 GB internal M.2 NVMe boot
  • NVIDIA ConnectX-6 Dx 2 × 100GbE OCP 3.0
  • 2 × 3200 W Titanium CRPS Premium
  • Ubuntu Server 22.04 LTS

Double-wide cards need the C95G riser pair, auxiliary power and four processors, and the L40S is a Controlled GPU. A rear hot-swap M.2 cage would take one of the two GPU positions, so boot drives go on the internal M.2 module; field upgrades also need the Full Length GPU Thermal Option Kit.

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Start with two sockets

Two-socket starter that grows

Two 24-core processors and 1 TB today, with the other two sockets and 32 DIMM slots left for later. Eight SAS SSDs on a RAID 940-8i and a pair of 25GbE ports cover a general database or application server until it needs all four processors.

  • 2 × Xeon 6 6728P — 24 cores @ 2.7 GHz, 210 W each
  • 16 × 64 GB TruDDR5 RDIMM — 1 TB, eight per processor
  • 8 × 1.92 TB 2.5-inch SAS SSD on a RAID 940-8i
  • 2 × 480 GB M.2 NVMe boot
  • Intel E810-DA2 2 × 25GbE OCP 3.0
  • 2 × 2000 W Titanium CRPS Premium
  • Windows Server 2025

Until the extra processors go in, the server is held to 32 DIMM slots (8 TB), PCIe slots 3, 5, 9 and 11, eight NVMe drives and single-wide GPUs, with no E3.S bays and CXL memory only by special bid. Processor option kits include heatsinks but not fans.

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10 — Refurbished alternatives

When a refurbished server makes more sense

Lenovo ThinkSystem isn’t in our refurbished configurator, and none of the re-certified servers we build has four sockets. Where two sockets and 8 TB of DDR4 are enough for the job, these HPE 2U models are the nearest refurbished match.

Gen10 Plus · re-certified

HPE ProLiant DL380 Gen10 Plus

  • 2U · two Ice Lake Xeon sockets
  • 32 DIMM slots · up to 8 TB DDR4-3200
  • Up to 24 × SFF or 12 × LFF
  • PCIe 4.0 · OCP 3.0 · iLO 5

Databases or virtual machines that need up to 8 TB of memory but not four processors.

Configure a refurbished DL380 Gen10 Plus →
Gen10 Plus · re-certified

HPE ProLiant DL385 Gen10 Plus

  • 2U · two AMD EPYC 7002/7003
  • Up to 128 cores
  • 32 DIMM slots · up to 8 TB DDR4
  • Up to 24 × SFF or 12 × LFF · iLO 5

Core-heavy consolidation where two EPYC sockets and 8 TB can stand in for a four-socket Xeon host.

Configure a refurbished DL385 Gen10 Plus →
11 — Full specifications

Lenovo ThinkSystem SR850 V4 specifications

Chassis & cooling

Form factor2U rack server, four sockets
Machine types7DJT (1-year warranty) · 7DJS (3-year) · 7DJU (3-year, SAP HANA configurations)
Dimensions (W × H × D)447 × 87 × 906 mm (2.5-inch chassis) or 946 mm deep (E3.S chassis) · 482 mm across the EIA flanges
WeightUp to 42 kg
Fans6 × 60 mm hot-swap, N+1 rotor redundancy · Standard 24K RPM single-rotor, Performance 20K RPM or Ultra 21K RPM dual-rotor
Liquid coolingOptional Processor Neptune Core Module, open loop, factory (CTO) only
ChipsetNone — integrated in the processor

Processor

SocketsTwo or four (one or three not supported)
FamilyIntel Xeon 6700P-series (P-cores)
Cores per processor8 to 86
TDP165 W to 350 W
Interconnect3 × UPI 2.0 links in a mesh
PCIe lanes88 × PCIe 5.0 per processor

Memory

Slots64 · 16 per processor · 8 channels × 2 DIMMs
TypesTruDDR5 RDIMM and 3DS RDIMM · CXL 2.0 E3.S 2T modules
DIMM sizes32, 64, 96 and 128 GB RDIMM · 256 GB 3DS RDIMM
Speed6400 MHz at 1 DPC · 5200 MHz at 2 DPC (RDIMM)
Maximum16 TB (64 × 256 GB) · 8 TB with two processors
CXL16 × 96 GB or 128 GB modules, four processors, E3.S chassis

Storage

Front8, 16 or 24 × 2.5" (SAS/SATA or AnyBay) · 8 to 32 × E3.S 1T NVMe · 8 or 16 × E3.S 2T for CXL
NVMeUp to 24 × 2.5" or 32 × E3.S, each on a PCIe 5.0 x4 link, no retimers
Boot1 or 2 × internal M.2, or 2 × rear hot-swap M.2 (full-height slot layouts)
ControllersOnboard NVMe with Intel VROC · RAID 545-8i, 940-8i, 940-16i · 440-16i HBA
Largest raw capacity1966.08 TB with 32 × 61.44 TB E3.S SSDs

Expansion & networking

PCIe slots9 (7 × Gen5 + 2 × Gen4, 6 FH + 3 LP) · 7 × Gen5 with the double-wide GPU risers
OCP2 × OCP 3.0 SFF, PCIe 5.0 x16, up to 400GbE
SerialOptional DB-9 COM port in slot 8
External storage440-16e SAS HBA · 32 Gb and 64 Gb Fibre Channel HBAs

Accelerators

GPUsUp to 4 × NVIDIA L4 or 2 × NVIDIA L40S
Double-wide slots4 and 10, on the C95G riser

Power

SuppliesUp to 2, hot-swap and redundant; both identical
AC Titanium2000, 2700 and 3200 W (230 V)
AC Platinum2700 W (230 V), CRPS v2.3 or v2.4
Other1300 W HVAC/HVDC · 1300 W −48 V DC

Ports & video

FrontExternal diagnostics port · optional 2 × USB 3 (5 Gb/s) and Mini DisplayPort
Rear2 × USB 3 (5 Gb/s) · VGA · 1GbE XCC management port
InternalOptional USB 3 port · MicroSD slot for XCC
Video16 MB, integrated in XCC3 · up to 1920 × 1200 at 60 Hz

Environment & warranty

ASHRAEClass A2 in most configurations; A3, A4 or H1 depending on the build
Operating temperature10–35 °C (A2)
Maximum altitude3,050 m
NoiseUp to 71 dBA at the bystander position, 100% CPU TDP, maximum configuration
Warranty1 or 3 years by machine type · customer-replaceable units and onsite, 9 × 5 next business day
12 — FAQ

SR850 V4 questions, answered from the documentation

What is the maximum memory of the Lenovo ThinkSystem SR850 V4?

16 TB with four processors, using 64 × 256 GB 3DS RDIMMs in all 64 slots. With two processors only half the slots are active, so the ceiling is 8 TB. The E3.S chassis can also take 16 CXL 2.0 modules of 96 GB or 128 GB alongside the DIMMs.

Which processors does the SR850 V4 support?

Seven Intel Xeon 6700P-series models: 6714P, 6724P, 6728P, 6738P, 6748P, 6768P and 6788P, spanning 8–86 cores and TDPs of 165–350 W. The server runs with two or four processors; configurations with one or three are not supported.

How many drives does the SR850 V4 hold?

Up to 24 × 2.5-inch hot-swap bays for SAS, SATA or NVMe, or up to 32 × E3.S 1T NVMe bays, plus two M.2 boot drives. Lenovo lists no layout that mixes the two front types, and E3.S layouts need four processors.

How many GPUs can the SR850 V4 take?

Four single-wide NVIDIA L4 cards or two double-wide NVIDIA L40S cards, all of the same model. The L40S needs the C95G riser, auxiliary power and four processors; a two-processor server takes single-wide cards only.

How many PCIe slots does the SR850 V4 have?

Nine, plus two OCP 3.0 slots: seven PCIe 5.0 and two PCIe 4.0, six full-height and three low-profile. The riser set for double-wide GPUs leaves seven slots, all Gen5. Neptune water cooling removes slots 6 to 8, and two-processor builds keep only slots 3, 5, 9 and 11.

What power supplies does the SR850 V4 use?

Two at most, redundant and identical: Titanium 2000, 2700 or 3200 W, Platinum 2700 W, a 1300 W HVAC/HVDC unit or a 1300 W −48 V DC unit. The AC supplies are 230 V models, and Lenovo lists no 115 V support for this server.

How big and heavy is the SR850 V4?

It is 447 mm wide, 87 mm high and 906 mm deep with 2.5-inch bays, or 946 mm deep in the E3.S chassis, and 482 mm across the rack flanges. Maximum weight is 42 kg. Measured from the rack flange to the power-supply handles it needs 890 mm (2.5-inch) or 930 mm (E3.S).

How does the SR850 V4 differ from the SR860 V4?

Both use the same Xeon 6700P processors, DIMMs and backplane kits and both reach 16 TB. The 4U SR860 V4 adds front bays (48 × 2.5-inch, or 32 E3.S plus 24 × 2.5-inch), as many as 18 PCIe slots, room for four double-wide GPUs and a four-supply power bay; the SR850 V4 puts the same memory into half the height.

What changed from the SR850 V3 to the SR850 V4?

The V4 moves from 4th Gen Xeon Scalable (up to 60 cores, 80 PCIe lanes) to Xeon 6700P (up to 86 cores, 88 lanes), lifts memory from 4800 to 6400 MHz, and adds E3.S bays, CXL memory, rear hot-swap M.2 and XClarity Controller 3. It lists up to nine PCIe slots where the V3 listed up to twelve.

Is the Lenovo ThinkSystem SR850 V4 end of life?

Lenovo’s product guide, updated on 7 September 2026, gives no end-of-service date for the SR850 V4. Base cover runs for one year or three, set by the machine type, and Lenovo Services sells one- or two-year extensions. Our end-of-life checker will show any date Lenovo publishes later.

Sources & verification

Where these figures come from

  • Lenovo ThinkSystem SR850 V4 Server (September 7, 2026) — Standard specifications (Table 3), SR850 V4 vs SR850 V3 (Table 2), processors (Tables 6–8), memory and CXL (Tables 11–13), backplanes and storage configurations (Tables 14 and 16), M.2 (Table 20), controllers (Table 26), VROC (Table 28), risers (Table 75), network adapters (Tables 78–79), GPUs (Table 81), fans (Table 86), power supplies (Table 87), dimensions (Table 103), inlet current (Table 104), operating environment, security and OS support.
  • Lenovo ThinkSystem SR860 V4 Server (September 7, 2026) — SR860 V4 limits quoted in the verdict and FAQ (Table 3, standard specifications).

Specifications are extracted from Lenovo’s published documents and independently re-checked line by line. Configurations are quote-based; availability and exact options are confirmed at quotation. Last reviewed 2026-09-11.

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